Return bend fittings for oil stills



July 19, 1932. F. c. FANTZ I RETURN BEND FITTINGS FOR OIL STILLS Original Filed'De 8, 1931 FIG.

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runs 0. ranrz, or wensrnia snows, nrssounr nnruan BEND rrr'rrnesl son on. aunts original application filed December 8, 1931, Serial No. 579,707. Divided and this application filed Februcry 3, 1932. Serial Itc. 590,629.- I

My invention relates to that class of re turn bends such as are described in my copending application Serial-No. 579,707, of which this ap lication is a division. I Return bends of this type are principally used to connect tubes in oil stills where they are subjected to both high pressures and temperatures so that they must be of very rugged construction in order to withstand the to conditions under which they are used. It is well known that generally the tubes are mounted in nests or banks with exceedingly close centers, therefore it is essential to pro,- vide a construction which will not only have 1d the requisite strength but this must be done in a very limited space. v

y invention has for its obj ect toconstruct a compound housing which will be capable of beingswung laterally to disengage the W housing from the tubes.

My means of accomplishing the foregoing objects may be more readily understoodby having reference to the accompanying drawing, which is hereunto annexed and. made a part hereof, in which- Fig; 1 is a side elevation of a fragmentary part of a pair of still tubes connected by my improved type of return bend, a portion of the well being broken away to show the interior construction;

Fig. 2 isa vertical section on the lines 2-2 in Fig. v1; and i n Fig. 3 is a similar View showing a difi'erent, though equivalent form of.holding the 35 sections together. 1

Similar reference numerals refer to similar parts throu bout the entire description. As shown in t e drawing, the tubes 1 and 2 are shownwith their ends upset, forming shoulders 3." As seen in Fl .2 the ends of these upset portions are beve edand adapted to contact corresponding surfaces on the faces of the return bend. As shownin Fig. 3 there is a ridge 5 projecting above the upset annular portion which is convex in cross section as clearly seen in-Fig. 3. The return bend 6 shown in Fig. 3 connects the two tubes 1 and 2 each face 7 of the return bend being provided with an annular V shaped recess 50 adapted to receive the ridge 5 and form a sists of two pairs 0 vided with abutments 19 are formed with their centers \on the center line of tight joint. The return bend 6 is mounted in As illustrated it concomplementary sections 9 and 10, and 11 and 12, the lower portions 13 of which contact the tubes and partially a compound housin encircle the same. Shoulders 14 are formed on the inner surface of these lower portions 13 which are adapted to be locked to the shoulders 3 on the tubes. In view of the fact that the construction of each half of the return bend is identical, 1 'shall confine myself to a description of a single end. The complementary sections have. upwardly extending arcuate side walls which serve as a. mounting for the tightening means. As illustrated these comprise portions 15 and 16, on the sections 9 and and 11 and 12 respectively, the portion on the section 9 has a boss lkformed thereon which is proa central aperture which is threaded. A set screw .18 is mounted in these threads, its inner end contacting one ofthe two abutments'19 formed on the external wall of the return bend 6. These the tubes 1 and 2. The portion 16 of the section 10 has an aperture formed therein andis ada ted to'shp over the boss 17. The wall 20 o this aperture-is slanted or flared outwardly so that the sections' maybe swung outwardly as shown in. dotted lines Fig.- 2. My device illustrated in Figs. 1 and 2 has reinforcin rings 21 mounted on the tubes 1 and 2. he upper edge of each of the rings abuts the shoulder 3 upset on the tube, its lower ed e is undercut to receive extensions 22 and 23 ormed on the lower portions of the housing sections 9 and 10. he ring 21 enga and 23 serves to hol together. It will be apparentthatby tightening the set screws 18 a tight joint, will be produced between the return bend 6-and the tubes 1 and 2.- In Fi 3 I- have shown ex-, tensions projecting downwardly and the ring is mounted on them to hold the sections together. Where this equivalent form of construction is employed the. upset portion of the tubes Land 2 which forms the shoulder should bemuc'h. heavier to furnish adequate ng the. extensions 22 the housing sections strength. Although 1 details of construction, means for the tightening device and the housing made in four sections, I do not wish to be understood as limiting myself thereby for it will be obvious to persons who are skilled in the art that the housing may be made in two instead of four sections and that other tightening means may be substituted for the one described, it being my wish to illustrate only a preferred form to show a concrete embodiment of my invention and I wish to be limited only by such limitations as appear in the hereinafter contained claims,

Having described invention what I reard as new and desire to secure by Letters atent is:

1. In a refinery apparatus, a return bend, a pair of shouldered tubes communicating therewith, a compound housing therefor, comprising complementary sections adapted to partially encircle the ends of said tubes and to be locked to the shoulders on the tubes, a boss on one of said complementary sectidns there being an aperture in the other section in which said boss is mounted, the walls of said aperture being flared outwardly whereby the lower portions of said sections can be swung outwardly and a set screw in said boss adapted to contact said return bend to hold said tubes and return bend in a tight joint.

2. In a refinery apparatus, a return bend, a pair of shouldered tubes communicating therewith, a four part housing therefor, comprisin complementary sections adapted to partia y encircle the ends of said tubes and tobe locked to the shoulders on the tubes, a boss on one of said complementary sections there being an aperture in the other section in which said boss is mounted, the walls of said aperture being flared outwardly whereby the lower portions of saidsections can be swung outwardly, and a set screw in said boss adapted tocontact said return bend to hold said tubes and return bend in a tight joint.

3, its a refinery apparatus, a return bend, a pair of shouldered tubes communicating therewith, a compound housing therefor, corn prising complementary sections adapted to partially enc cle the ends of said and to be loclred o the shoulders on the tubes, said complementary sections have shown specific a boss on one of there being an aperture in the other section in which said boss is mounted, the walls of said aperture being flared outwardly erebythe lower portions of sections can he swung outwardly, and a set screw in said boss $9 to contact said retrmi bend to hold tubes and return i l tig goint, recine h 5 its uni V Q 1 terms on said nous= such as the mounting therewith, a

shouldered tubes communicating compound housing therefor, comprising complementary sections ada ted to partially encircle the ends of said tu es and to be locked to the shoulders on the tubes, a "(0 boss on one of said complementary sections there being an aperture in the other section in which said boss is mounted, the walls of said aperture being flared outwardly whereby the lower portions of said sections can be swung outwardly, and a set screw in said boss adapted to contact said return bend to hold said tubes, and return bend in a tight joint, and means to hold said sections together.

5. In a refinery apparatus, a return bend adapted to connect a pair of shouldered tubes, of a compound housing therefor, comprising complementary sections having arcuate flanges adapted tobe locked to the shoulders on the tubes, a boss on one of said comples5 mentary sections there being an aperture in the other section in which said boss is mounted, the walls of said aperture being flared outwardly whereby the lower portions of said sections can be swung outwardly, and a set screw in said boss adapted to contact said a pair of return bend to hold said tubes and return bend in a tight joint.

In witness whereof, I hereunto set my hand.

FRED C. FANTZ. 

